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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f07f4b989e1f6d62c75163d28f9af7321b978d7d4a433d8cf0e4fe7fcf0ca0' 
  AND token = 'qOu9Z9gV6PVcVWEJII9oNYAcH7cCaqZ4+XPa/qZV5Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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