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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4728d023f7008ef4e758115f9494953ff20b1aa1c5d366be646b1f51d55cd986' 
  AND token = 'h5cZ9RVIiXEqeYllclJ+X5y0T+ERDXjsKaPQzkOdMDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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