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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f74ea9759fba85e7b24ed7250af75e34b724bafaed68a62a21a189a3f3f7e1' 
  AND token = 'PbBrhUVsOi8MYIiVJr/1a8P+UkABqwk7p/pVQJAhXWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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