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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48eb6c162ff773232b224955477e3130e4be3483fd8db1cc656fd8096a023e40' 
  AND token = '8woiAD0al3VOl3rSDeVbMSkgELeZrMrHmdjapDPdJHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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