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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953e4084341de222abf3b5d65f723a7f471a69d16f83729d8e8307e4583532ad' 
  AND token = 'M0k3eRhmH3fpA5a4k6KKtGUfHRm+WP3pgzPgPFy5IXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00177

JSON explain

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