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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6358ddbfacd0dd261d47a5adc2cdc370aa6d9b7dbd5b8c062c60755a4d9506' 
  AND token = 'Laxk0AsCqKJfL5qlzAcjYwiO+0y6S6UqKZ53oU7BxVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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