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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9d9e7830befbb947b8d92cf968a6db0be7a41979f4b2b2a16721492e421be8' 
  AND token = 'LXRKwrfeP11hj+xxINHGtR6KgK6OK/r0uxfjgknlZQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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