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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3e96ee7d0e4f2a5d90f1b838c089366ea8e5f29b90fc39d49a5d12af6f5f7f' 
  AND token = 'Qbs78iEkn3/u8eraTZrzhEP0TTRBkfYOFb3OQSowAjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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