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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f541136fd82b4eaecae222effa4230cdbee2ba47af23ca1541efbcad9dcefdd7' 
  AND token = 'vkZAUvo7Jl8FOj6D3gv7iQ8MYihGz3jEUcnr2naS6/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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