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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06ce3f56ca08b6760d4d64ef5ec1cf300f9482ddccd8c0c2e72bf1bb68db8c3' 
  AND token = 'r1ysgcjXkYG8ov5mk6CB4336hD9YqWn7iHvdrZAs+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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