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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525d1a8df2d806dc136c2c4ea184c241bd65cc7741d252b8145cff9d7058ca38' 
  AND token = 'TPPcuL7HhYYMZWvViEOfOVAvPKA4o+waCrRrmtql8co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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