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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1277ac7c4f2501ad4884118ded5a37ea17ce9caf115516d69716a4c8103314' 
  AND token = '0lq9domhIv0xGFb1vUnRfKnAVfDbM5lGo0b94oUJXFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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