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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30760917be91d8f30f756aadc18cbe700c982380d98d36f33350d1f5a2a6275f' 
  AND token = 'cUWQ/PBLl0X2+WDBqdfilArrLKC1kC83aCu5D8HgRLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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