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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66bca6fa7a259517ae3b607bd21b45ed3d3bdca8cc0ca1d3740591945fa35e7' 
  AND token = '3VWVTaZNYJefrMkCg+nipf5d8rNqoann7OzBik+8oT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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