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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c597e4fb0c6b9d4d02dd5037ebf0f11a8b8e570e0c08e99ffebb91d69bbe73b' 
  AND token = 'cn7Sko1DgqyuWHju7mz/MYlbngd5x8iFTi3go+Vw8DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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