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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb89db806de455e66eef65a5f7726374eb33d584a755e15462c1e884778da2d' 
  AND token = '61+b/BPNd2WIvvck9OB9advOOWezqowlH5p8U7eQ8BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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