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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641f9eb82352f2954ce248cda1a5a02ae81d55a0eb40d2577e06fd724d20f274' 
  AND token = 'WJ3caWYU1xGexaC6IspFsV1AttCjgxtCSAgT3hXpKGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}