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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bfceac8cb6291f87227253eb3c660ab19101c710e2435fae148f4f41b75765' 
  AND token = 'nIsGw4wvCZj5Re9qld05s6L3tZW+0i+opnf/UcC+dLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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