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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688cddee4c87b95855c4e99052d6421caaeea12a3c490637166f64b16b9a3a00' 
  AND token = 'JCLPf2GW1kubZzW/y6fFlybuXmGep1tzEpw2nXioYTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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