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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6505e0f51b849c2d48e84ef0be66b8c12844450e8741191495b4c7e5773906f1' 
  AND token = 'Dh0Mz6jkbJkBk+AVl08qAc8n/wWGNRuYLWkYGHuXDU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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