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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993f5b9f86d9b1694a99838b2eb9f0e793f131960acf0416ad0a8db63b97ab40' 
  AND token = 'TmBeX4Ywt1d6i22RI9n+EXX7MgBSEFyut4H25UeIFig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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