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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811383daae30908d135457413a4e1df09ebb5bbb19f3ed79083a91e600d6dd28' 
  AND token = '77SI5kTsv6jYkxNnoSur7Jtgpt5T+GIJuuw7OGpBpnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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