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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e29fac60bde997504f278ab9b191bd35331de4c2019c9eefd126cc6da79e10' 
  AND token = 'IsJrRi5wpE6oDC6/Igxq/Z/h/oa1hsuzL/VaTi3dGVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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