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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f901de0a8c9399bcc44100a95b6073d796657f1dbe314a069263c8e1f7956bba' 
  AND token = '0ZSlQvN6CMPFzoqEGkxf4ysdrU7IoijQtcVzTdiDGd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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