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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75fed631564610a5d34b0545ab8d366e12cffc61aa889b706d479e7de67ca83' 
  AND token = 'BQyu3IiH/AAH6fF6ePcFlYB9j+K+W/dnscd20C8GyFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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