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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f9b9fd7a4b247cf134698e0cc633fb81b1823fccfe284b7fca336f3da3af5d' 
  AND token = 'YMsvI79b5jLvXpH4D3EJMf7a14FwE2z5OxARP+zJJSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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