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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbe4a43a2432457c9748bee24886622078c5f5ca4a8b610b280d970246d4409' 
  AND token = 'NX8rlzu/v4aIeKDqLiLHrivJSsWijNictl0kT5PRiNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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