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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a584b67dfbd3aa719698402fcdbb59ecda523164b3a54b1dfe50605f7a494633' 
  AND token = 'nNX5X/tLjI2hY5f5J7RCepn+a6qrQs64s8K8J7Fmr2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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