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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3311778a3f84b61fda3db58bcf90d4789580e269e73b39a1bf03776c8e30c1' 
  AND token = 'SM73sSzJUJmebjxyeIKhPxeGRTETzIdOC9+uYHm3HJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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