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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9a811135b1035ff718ef269a2f58e591361284908542831f1f59beee17f871' 
  AND token = 'kEbKv3HjNzJA01Q33YIyLtD+PqTj1UYfwU1q8GxEFcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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