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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139846ceac9ade111a8a2ceeffd77321c91eaeb5f2fc5862b76818e0b612d9e7' 
  AND token = 'XjJ9UhgyCXUJynhCfgZn1xBelqeiUpkoqqC7wuJRZng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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