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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878e78061e2475db20e6b4d16bddc3cb9e41f10c9cf5e4471181e28c64337d06' 
  AND token = 'aGvVwQWxxBH1d+Glc198QoNfDsRrbZJ8BIQAQWOxd9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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