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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1954f484d83247d10a52d83852f4b1bd1335f1e8a9ef51991eb78fe5ddebebb8' 
  AND token = 'AB+NVr4oDMSaEDNRhK5TRcyt/rZH/IUzK11s4jiKP/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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