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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708b6791a29beae55c468cc832d3c1b673e5c1b955423ffceef29cc6a9b43e03' 
  AND token = 'eXlw4Ro5bLgli9XfeunrB32JSIpGGM1+v9l/H7hL54A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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