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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca8a6293f44c82d6ce79d166ecab33c9795191daf40237215d635a961877dad' 
  AND token = '84G7J335z45MGADJ5ah9krimwWaCeK/3HVkNeyrnp4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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