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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c31bfb584154c0b081192d66c3e19eca7508338801dc1d48d19eeabfc7e761' 
  AND token = 'duhGylqZq7M68fX8P2Zc61Y4FwSkWnGrrIC7XE7GXlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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