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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77dd48604b33096f1104bd3b6b594c419bc7d74e1f7bda1011bd751f869a7bd' 
  AND token = '+3kQahukGa+wJ/28ngNvI+EKNeGzUbyHUqSTIoirgMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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