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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47279a32ab2efabf2a679671f36c482517d3f168f809da21e24a93a3dd1859b7' 
  AND token = 'IkWS/WTyy7bIhU/NVXgu9TscfJy8p9UVKy7iyvlFkWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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