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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dec28d1866564f4aa56d6ab30dc34eaf2bf1666ad9162bb352763551372e90e' 
  AND token = 'ZkQjx/GWx0s78U6O3xvp6CUn6b9nwobW5NzIkZuKoXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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