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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e51375c830be27cd18b8007ecb5dd4b573119861b4eadb1d88ae91e043d768e' 
  AND token = 'wPgRkPL9xC8iV4lDNrxPO9Lbg/S2GePD13ynlNgLNd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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