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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176318b512ae8a3dd734d7e4808e56c34fe998bb406a16691c507c677b600cf5' 
  AND token = 'aNxn56fIQZNZHgCIhWRu1bMWmcv/SyQ9/Xin90XBuyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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