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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77123c96d0dfe04efba1038c8c9b58cb058c239f2f70a8d7ab6bbae0f1c49e33' 
  AND token = 'VOhZ5jmEP7UXmTWdeJg7MTxxKWCYCHqI0ncX4Lu4yFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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