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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a0a8f0e1251429ed8da486691aa4e4564e7061f28c90e535ae1e13f7d1decd' 
  AND token = 'U+e2AHaIBLX8jHfuK3BGX8MejgwBn4wKp3PSTdZvjoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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