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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678422413bc11fd2e164c22d5250b6e6ced731e3d1976f68323f8944d58e293c' 
  AND token = 'SgtZ4BYc6DYzowqpwAHiuZgSj9aq37qoDUMezo88M/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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