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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2149ca1f813428e672efb9c5fd24de6a42e74f7c53acefc1185ac5ec8b053ac7' 
  AND token = 'BgUm2n5Oglom+TpbDhS7reenUoSbs6lxUw6lCvUkZ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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