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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bc62ea989cc1ff68c51702dce088bf8e65b62bb13ef635436806be49054900' 
  AND token = 'WtRPgmV73gdQhqGbBhlp91coMpos/Yna+nES7RYyDy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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