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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7ede2f9799b4f8c316dd810d4b91e36b3e5f3715a12444e5bc1852ad957dce' 
  AND token = 'Al243geEv9GjlcMw7UUhM949SLNwqq9xghwySw0y0tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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