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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8204b9d2c1b3f11e7215005bdc095ecfb92c1a1fbccc1cc0f52c1c01772fc441' 
  AND token = '+aDyQwCMBmjX5BvV69z7bgXJR/9Jdoy2TZ1libY93uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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