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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5666ceb43e2b381a6585f23b7f0514b13975b459a3135954198a188f56200d' 
  AND token = 'Aap3cn3spbEkA+Oo1OumeI2C3N1MBV0ARzMWkVWdz1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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