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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aae2a85fc50a322c53bc7006cf5775639ba60a956ea0fa002750d6a3d2c2bc5' 
  AND token = 'pAu8t2QzZHZqW862mw/HQ37/S6GayjeTOaOaG5H1Nuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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