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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54de610202a2610b42f9b0e4a317e94cd810178b12e16ed1d4c95cceeed34fa8' 
  AND token = 'HUmKOt7NlcLroxO8iJMRuO5g5UpJkGnOw0K/Mqzk/Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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