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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a80a9bc8498ff127154c29249d0a4b4daf8ae557fe5f295a99d147b7f704dc3' 
  AND token = 'rgmNBrmyT8zKu4HMYyk7yXciGhEsi2b1lIeG0TI9T9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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