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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2724c582409a7f855f280745deb467568a707fad45e3b501a1ba33370f97a8f7' 
  AND token = 'F89b6/pEDSfFf1ozZjIfF6S2xxPTjC4YWIckJahjneg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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