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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a812bfccf53f53ee790ed3dce5856312896ea59968f6024cf0cbb773d77a6e95' 
  AND token = '0HhZwBhs1z8TpMTg+BrbxLwukkIxWj5zQYeTyXOMi1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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