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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb9916cec3e8482ea9571df1ec57d1dab4ef9b704b482e77c7b7ef71e46fadc' 
  AND token = 'cmnzd6mEpO5EZbeF4NWS+oQ/du2ax2KkwaUNEs3jFqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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