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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17a5c944fcbe97050b624d32a174832f2c04e71c2b9a806a6de7e91f4f5d8e9' 
  AND token = '0QX8EbbZ8AY5QXDG6XDV702pO+nGPoGEXfrV50xfqN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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