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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0767cf50fb0496be6c9986348a796a466080feb09db1914b31d770739e061650' 
  AND token = 'GY7i3iP9AS+W2LG5tTpyefFu6oPG3KrgoHJ8M9gNyKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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