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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3e28898769d6db0ec8ae0d9b93ac86eced4ddaba65ffedca06627c07e9717e' 
  AND token = 'fGn8i7ofMXKRC9GWwFmcW4Tyj+PrrfZEu8bZBbjLFNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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