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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf279a35cb0dfc43d462afe3ea3396181fac305fd221ea6277c7603f6bb302c' 
  AND token = 'a9OlQvpnWSlAbF+4BE3xAbo+RDaw70jqfcVnC9akhik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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