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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9726013f321453bea3559b962a2dd8b9224ac43b8aaae4acb32587ca6e0474' 
  AND token = 'xYjrEVizU4z1dOoUnNouFSE7mQelY/qgT73GzN4Cw/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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