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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bda0551063e800ae610ff9f7bb06332ae4364f37f7a65a6265f9df034b418b5' 
  AND token = 'iTEkp7C/8pwaW2wnf12K1Plx4B2yngR/LA6DAmIGSH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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