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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89a8c4787d30081ff5f1666533074f5dc782b444a9fcd541bd54c15271051b9' 
  AND token = '2PO5gfdudF52FWfAy2S2NlJlD+k5SSN8O13rBMmOGWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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