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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4db797c7728cbc4078ba1630d6f28faa70d95e282f58ef61431a2f56a4e9eef' 
  AND token = 'oAG+Ne+AWqqykIkwM8M68OcXmOlYt8jYjLsYW0jdgFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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