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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac74193d539ee2e104e90adaa4e67ad1f9201caa4941c67473dbc917589e3c85' 
  AND token = 'aKCfx8YUdevK3xGv+AE+B9K2/TEpg/lNKHRAg/jjU4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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