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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28347d30c9708b648bb33ff15ab1e03520125fd04d7477bfe8b124c99ca6156' 
  AND token = 'bhRyGn3at/65qCsjMzB87n1/8gWrnqeBIytTdOurM4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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