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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5614def36870792baed3374dcbc7e4ec0003ec10760a1930e0f5fd4b475aa35' 
  AND token = 'JZqlI/V471dytP5pau706ceJyi2QqFw+PGfJw8uKeeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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