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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40628aaf04f86b669dbc9f92ee93ff9471b7311da84d998bea7de54b01ae44d7' 
  AND token = '8exOllP/t4EWMW+GnH4GiuDum20dEbzOZ4yY6QwEfxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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