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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552d6a716bdc082f19107a97b7749e8d981227ed66b71c6cc0327a149a6bb2a3' 
  AND token = '7dlH5ORmDgkb42r5SubvD12xNP5FJrcSrXVxDTYuVk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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