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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a203f6f5f204fa96217ce74b93ce06af4fad29d7121a11d6aa4bd588d566935' 
  AND token = 'FyfaUgIOZ7yUyVCTQiYzWM4XsV1tuhifxQKUkRhmIx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00601

JSON explain

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