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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926ac203b4cddca766d5898fd1085562db93223c7222520f345f9d75cd531d9e' 
  AND token = 'L27hN5dsth8eMEv77AbPSJyDF8966oiGEv1fdwapXOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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