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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2d549b570826957103093d67f8658b6d4ab97dad9f16f519d01343b7ac260c' 
  AND token = 'owRi+rMwNmbXLAicoPZyXir0O406nvzPewAnrw+eJ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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